Seibert in Wetzlar No. 8984

Petrological (Polarizing, Mineral) Microscope, c. 1898

(mittleres Polarisationsmikrokop)

Seibert in Wetzlar No. 8984. Petrological (Polarizing) Microscope, c. 1898

Seibert in Wetzlar No. 8984. Petrological (Polarizing) Microscope, c. 1898

Seibert in Wetzlar No. 8984. Petrological (Polarizing) Microscope, c. 1898

Seibert in Wetzlar No. 8984. Petrological (Polarizing) Microscope, c. 1898 Seibert in Wetzlar No. 8984. Petrological (Polarizing) Microscope, c. 1898. Accessories

Seibert in Wetzlar No. 8984. Petrological (Polarizing) Microscope, c. 1898. Rotating stage

Seibert in Wetzlar No. 8984. Petrological (Polarizing) Microscope, c. 1898, Substage

Seibert in Wetzlar No. 8984. Petrological (Polarizing) Microscope, c. 1898. Wood case

Seibert in Wetzlar No. 8984. Petrological (Polarizing) Microscope, c. 1898. Stored in the case

While this particular model is not described in either the 1885 or 1903 Seibert calatogs, it most likely conforms to the middle polarizing model IIb described in the 1903 catalog, but with the addition of the Bertrand lens. It features a substage polarizing condenser with a removable top element that is focused using a lever mechanism, an analyzing prism mounted in the tube in a slide-in holder, a centerable rotating stage with calibrations in degrees and venier, and a focusing slot which holds a Bertrand lens. An additional slot is provided that accomodates the compensator plates. Another, less complicated, polarizing microscope of similar vintage is also represented in the collection.

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